S = input()

if S.count('R') == 3:
    print(3)
elif S.count('R') == 2:
    if S[1] == 'S':
        print(1)
    else:
        print(2)
elif S.count('R') == 1:
    print(1)
else:
    print(0) S = input() S input() input if S.count('R') == 3:
    print(3)
elif S.count('R') == 2:
    if S[1] == 'S':
        print(1)
    else:
        print(2)
elif S.count('R') == 1:
    print(1)
else:
    print(0) S.count('R') == 3 S.count('R') S.count S count 'R' 3 print(3) print 3 elif S.count('R') == 2:
    if S[1] == 'S':
        print(1)
    else:
        print(2) S.count('R') == 2 S.count('R') S.count S count 'R' 2 if S[1] == 'S':
        print(1)
    else:
        print(2) S[1] == 'S' S[1] S 1 'S' print(1) print 1 print(2) print 2 elif S.count('R') == 1:
    print(1) S.count('R') == 1 S.count('R') S.count S count 'R' 1 print(1) print 1 print(0) print 0 S = input() input() S
S = input()

if S.count('R') == 3:
    print(3)
elif S.count('R') == 2:
    if S[1] == 'S':
        print(1)
    else:
        print(2)
elif S.count('R') == 1:
    print(1)
else:
    print(0)